CN109412641A - A kind of carrier wave superposition multiple access method and system based on Direct Sequence Spread Spectrum - Google Patents
A kind of carrier wave superposition multiple access method and system based on Direct Sequence Spread Spectrum Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18582—Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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Abstract
The invention discloses a kind of, and the carrier wave based on Direct Sequence Spread Spectrum is superimposed multiple access method, including signal emission process, signal emission process is the following steps are included: S11: carrying out message sink coding, channel coding and BPSK to the first via signal that needs transmit and modulates, obtains the modulated signal s of the first via1(t)；Message sink coding, channel coding and BPSK modulation are carried out to the second road signal that needs transmit, obtain the modulated signal s in the second tunnel2(t)；Wherein, first via signal is broadband signal, and second road signal is narrow band signal；S12: by s2(t) it is multiplied with pseudo-random sequence c (t), the signal after being spreadS13: by s1(t) andIt is overlapped, after up-conversion, is launched by antenna.The invention also discloses the systems using this method.The present invention sufficiently combines the characteristics of satellite-signal business different transmission rates, is able to ascend band efficiency, and saves the time interval resource etc. of satellite system.
Description
Technical field
The present invention relates to satellite communication fields, connect more particularly to a kind of carrier wave superposition multiple access based on Direct Sequence Spread Spectrum
Enter method and system.
Background technique
The trade transportation in the whole world 90% is undertaken by transporting by sea, and sea-freight has become the strategic industry of country.Satellite communication due to
It without geographical restrictions, is the preferred means of overocean communications.The development and change of shipping industry propose maritime satellite communication higher
It is required that.
Since bandwidth resources are rare, rate costly, are currently used primarily in official traffic for satellite communication, ensure ship with
Periodic traffic contact on the bank, generally based on voice and E-mail communication.Official traffic and satellite signaling-information are general
It is required that it is reliable and stable, but portfolio is usually not many, and satellite communication link most of time is idle, therefore the present invention claims this
Class business is narrow band service signal, if this delineation of activities is individually gone out independent channel or time slot, it will cause the money of system
Source waste.At the same time, the sailor to work on ship due to living for a long time far from kith and kin and land, there is an urgent need to the external world
Link up and exchange, with improve ocean life and amusement condition, alleviation stress, this kind of demand generally require very high rate with
And very high bandwidth is occupied, the present invention is referred to as broadband service signal.
According to different business demand and flexibility, and the frequency spectrum resource of satellite is adequately utilized, can be greatly reduced
The cost of satellite communication, therefore have very important significance.
The satellite communication system of communication service is provided towards marine ship in the world at present, it is diversified to need support user
Communication requirement provides multiple service, such as: receiving and dispatching mail, instant messaging, web page browsing, voice communication, video flowing, ship
Positioning, content service etc..According to the different application demand of user, system supports the data industry of 16Kbps~19.4Mbps rate
Business, and a path channels can support speech, data or image connection between multiple websites simultaneously, in satellite communication system,
If modulation system is fixed, transmission rate is directly related with bandwidth.For the channel that different bandwidth requires, such as the signaling of low speed
Channel, text, voice traffic channel, there are also the video stream signals of high speed, when mainly using in existing satellite communication system
Divide the form of (Time Divide, TD) or frequency division (Frequency Divide, FD), the cost paid is the frequency of system
Reduction with utilization rate.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of, and the carrier wave based on Direct Sequence Spread Spectrum is superimposed multiple access method
And system, it is able to ascend band efficiency, saves system time gap resource.
Technical solution: the carrier wave of the present invention based on Direct Sequence Spread Spectrum is superimposed multiple access method, including signal
Emission process, signal emission process the following steps are included:
S11: message sink coding, channel coding and BPSK are carried out to the first via signal that needs transmit and modulated, the first via is obtained
Modulated signal s1(t)；Message sink coding, channel coding and BPSK modulation are carried out to the second road signal that needs transmit, obtained
The modulated signal s in second tunnel2(t)；Wherein, first via signal is broadband signal, and second road signal is narrow band signal；
S12: by s2(t) it is multiplied with pseudo-random sequence c (t), the signal after being spread
S13: by s1(t) andIt is overlapped, after up-conversion, is launched by antenna.
Further, further include signal receive process, signal receive process the following steps are included:
S21: electromagnetic wave signal is received by antenna, then obtains intermediate-freuqncy signal through low-noise amplifier and low-converter；
S22: a part of intermediate-freuqncy signal is by obtaining first after bandpass filtering, BPSK demodulation, channel decoding and source decoding
The information of road Wideband signal transmission；
S23: another part intermediate-freuqncy signal is multiplied with pseudo-random sequence c (t), the signal after being de-spread, then will despreading
Signal afterwards is by obtaining the letter of the second road Wideband signal transmission after bandpass filtering, BPSK demodulation, channel decoding and source decoding
Breath.
Further, the pseudo-random sequence c (t) is generated by shift register.
Further, the pseudo-random sequence c (t) is M sequence or Gold sequence.
Using the system of the carrier wave superposition multiple access method of the present invention based on Direct Sequence Spread Spectrum, including transmitting
Machine and receiver；Transmitter includes the first source encoder and the second source encoder, and the input terminal of the first source encoder is defeated
Entering and needs the first via signal transmitted, the output end of the first source encoder connects the input terminal of the first channel encoder, and first
The output end of channel encoder connects the input terminal of the first BPSK modulator, and the output end of the first BPSK modulator connects adder
An input terminal, the input terminal input of the second source encoder needs the second road signal transmitted, the second source encoder
Output end connects the input terminal of second channel encoder, and the output end of second channel encoder connects the defeated of the 2nd BPSK modulator
Enter end, an input terminal of the output end connection multiplier of the 2nd BPSK modulator, another input terminal of multiplier inputs pseudo-
Random sequence c (t), another input terminal of the output end connection adder of multiplier, the output end of adder connect up-conversion
The output end of the input terminal of device, upconverter connects antenna.
Further, the receiver includes low-noise amplifier, and antenna received signal is transmitted by low-noise amplifier
To the input terminal of low-converter, the output end of low-converter be separately connected the first bandpass filter input terminal and multiplier one
A input terminal, the output end of the first bandpass filter connect the input terminal of the first BPSK demodulator, the first BPSK demodulator it is defeated
Outlet connects the input terminal of the first channel decoder, and the output end of the first channel decoder connects the input of the first source decoder
End, the information of the output end output first via Wideband signal transmission of the first source decoder；Another input terminal of multiplier is defeated
Enter pseudo-random sequence c (t), the output end of multiplier connects the input terminal of the second bandpass filter, the second bandpass filter it is defeated
Outlet connects the input terminal of the 2nd BPSK demodulator, the input of the output end connection second channel decoder of the 2nd BPSK demodulator
End, the output end of second channel decoder connect the input terminal of the second source decoder, and the output end of the second source decoder is defeated
The information of second road Wideband signal transmission out.
The utility model has the advantages that the invention discloses a kind of, the carrier wave based on Direct Sequence Spread Spectrum is superimposed multiple access method and is
System, compared with prior art, have it is following the utility model has the advantages that
1) present invention sufficiently combines the characteristics of satellite-signal business different transmission rates, and the signal all the way of narrowband is passed through expansion
It is superimposed upon among broadband signal after frequency, increases the band efficiency of system, saved the time interval resource of system；
2) present invention incorporates satellite communications to have the service channel, the service channel of low speed or the signaling of low speed of high speed to lead to
The transmission feature in road；
3) since narrowband spread-spectrum signal is in transmission process, power spectral density polar region can usually be lower than noise power spectrum
Density, and it can be controlled by spread spectrum code sequence, caused its power spectrum statistical property similar to white noise, caused the letter of transmitting
Number be submerged among noise completely, if can not be detected at all without special receiving device, therefore the channel have it is very strong
Concealment；As computer disposal speed is getting faster and the appearance of quantum calculation, higher-layer encryption reliability substantially reduce, because
This realizes the effect of anti-intercepting and capturing in physical layer, by the safety for the system that greatly promotes；If transmission security is believed in satellite communication system
Number, it is difficult to be trapped；The signal hiding is among normal signal simultaneously, it more difficult to be detected, therefore the present invention is substantially
Realize a kind of effect of Communication hiding；
4) for the spread-spectrum signal of low rate, since the bandwidth that it is occupied is relatively large, so the frequency spectrum of fraction declines
It will not make signal Severe distortion, it may have the characteristics of mitigating frequency-selective fading；Satellite communication is declined or right due to it by rain
The case where fluid layer flashing etc. influences, will appear communication disruption once in a while, can be to the user's body of Commercial Satellite Communications System when this
Test it is excessively poor, and due to communication disruption, the increase of the risk of user also at double；Use Direct-Spread communication party of the invention
Case can keep communication in the case where exceedingly odious；
5) business support flexibility and changeability of the present invention, spread-spectrum signal can according to need the arbitrary portion for being superimposed upon authorized spectrum band
Or all.
Detailed description of the invention
Fig. 1 is the schematic diagram of end-to-end satellite communication system in the specific embodiment of the invention；
Fig. 2 is the schematic diagram of transmitter in the specific embodiment of the invention；
Fig. 3 is the schematic diagram of receiver in the specific embodiment of the invention；
Fig. 4 is Direct Sequence Spread Spectrum OCMA spectral overlay front and back schematic diagram in the specific embodiment of the invention；
Fig. 5 is superimposed schematic diagram with noise for Direct-Spread OCMA frequency spectrum in the specific embodiment of the invention；
Fig. 6 is two-way channel Direct-Spread OCMA spectral overlay schematic diagram in the specific embodiment of the invention；
Fig. 7 is the bit error rate that two paths of signals uses BPSK modulation in the specific embodiment of the invention.
Specific embodiment
Present embodiment discloses a kind of carrier wave superposition multiple access method based on Direct Sequence Spread Spectrum, including letter
Number emission process and signal receive process.The english abbreviation of " carrier wave superposition multiple access " is OCMA.
Signal emission process the following steps are included:
S11: message sink coding, channel coding and BPSK are carried out to the first via signal that needs transmit and modulated, the first via is obtained
Modulated signal s1(t), as shown in formula (1)；To the second road signal transmitted of needs carry out message sink coding, channel coding and
BPSK modulation, obtains the modulated signal s in the second tunnel2(t), as shown in formula (2)；Wherein, first via signal is broadband signal, the
Two road signals are narrow band signal；Message sink coding mode can choose huffman coding, L-Z coding etc., reduces redundancy, increases transmission
Efficiency；Channel coding generally uses convolutional code, LDPC code or Polar code etc., increases redundancy by specific mode, is promoted and compiled
The error correcting capability of code；
Wherein, P1For the mean power of first via signal, P2For the mean power of second road signal, f0For carrier frequency, θ1
And θ2For the information of BPSK modulation, m1(t) and m2It (t) is binary digital signal, m1(t),m2(t)=an, an∈ { -1 ,+1 },
nTb≤t≤(n+1)Tb, 1/TbFor bit rate；
S12: by s2(t) it is multiplied with pseudo-random sequence c (t), the signal after being spreadAs shown in formula (3)；
Wherein, c (t)=cn, cn∈ { -1 ,+1 }, kTc≤t≤(k+1)Tc, c (t) is PN code sequence, and rate is known as code
Piece rate, spreading rate Rc=1/Tc；Spreading rate is the integral multiple of information rate, spreading factor N=Rc/Rb=Tb/Tc, and expand
Frequency factor needs are selected according to the performance indicator and business demand of transmission；
S13: by s1(t) andIt is overlapped, after up-conversion, is launched by antenna.Letter after up-conversion
Number S (t) is as shown in formula (4)；
According to Principle of Communication basic knowledge it is found that s1(t) power spectrum function PS1(f) andPower spectrum function PS2
(f) it is respectively as follows:
Above-mentioned spectrum diagram is as shown in Figure 4.By above-mentioned spectrum analysis it is found that the mean power in two paths of signals is identical
In the case where, the bandwidth expansion of spread-spectrum signal N=Tb/TcTimes, power spectral density has dropped N times.Assuming that satellite communication height
Under this white noise channel, in order to normally receive bpsk signal, need receiving end signal power spectrum center dot density and noise spectrum close
The ratio of degree is 10dB.If the transmission power of first via broadband signal is 10 times of the second road spread spectrum front signal transmission power, the
It is 10 times of noise spectral density that two tunnels, which spread front signal power spectrum center dot density, and narrow band signal is using spread spectrum BPSK transmission, spread spectrum
Factor N=1024 is equivalent to 1024 times of bandwidth expansion, then the power spectral density of spread-spectrum signal has dropped 1024 times (about
30dB).At this point, the power spectral density ratio of the power spectrum center dot density of signal and noise is -10dB, spread-spectrum signal after spread spectrum
Substantially it is submerged in noise (power spectral density of spread-spectrum signal be noise 1/10th).
Signal receive process the following steps are included:
S21: electromagnetic wave signal is received by antenna, then obtains intermediate-freuqncy signal y through low-noise amplifier and low-converter
(t)；
Wherein, n (t) is the additive white Gaussian noise during satellite communication transmission, and bilateral power spectral density is
S22: a part of intermediate-freuqncy signal is by obtaining first after bandpass filtering, BPSK demodulation, channel decoding and source decoding
The information of road Wideband signal transmission；
In step S22, the signal received is directly demodulated, assumes that the transmission power of broadband signal is narrow in transmitters
10 times of band signal power (guarantee that the QoS of broadband signal, signal-to-noise ratio reach in the case where guaranteeing that original broadband BPSK can be demodulated
The condition of 10dB), 1024 times of spread-spectrum signals are considered as to the interference of broadband signal at this time；Due to carrying out 1024 times of spread spectrums, spread spectrum letter
Number power be only the 1/10 of noise power, therefore, be superimposed spread-spectrum signal after, first via broadband signal performance degradation
Degradation=10log100-10log (100/1.1) ≈ 0.41dB (8)
Upper examination illustrates broadband signal only by the performance degradation of 0.41dB, and the influence to the road bpsk signal is smaller, can
Normally to demodulate；The transmission letter of first via broadband signal can be obtained by channel decoding and source decoding for signal after demodulation
Breath；
S23: another part intermediate-freuqncy signal is multiplied with pseudo-random sequence c (t), the signal after being de-spread, then will despreading
Signal afterwards is by obtaining the letter of the second road narrowband signal transmission after bandpass filtering, BPSK demodulation, channel decoding and source decoding
Breath.
After being de-spread in above formula by spreading code, former broadband signal is equivalent to be spread across, and spectral density is equivalent to drop
Low 30dB (assuming that 1024 times of spread spectrums), for broadband signal in the bandwidth of transmission, power spectrum drops to 10dB under noise power spectrum.
Due to the height autocorrelation of spreading code, low-rate signal restores the signal to before spreading after being despread, and noise signal is passed through
After spread spectrum, noise power spectrum is remained unchanged.At this point, narrow-band power spectrum central point is 10 times of noise power spectrum, due to
Broadband signal is by spreading and by the way that after bandpass filter, power spectrum reduces 30dB.Therefore, low-rate signal reaches BPSK
The standard of demodulation, is normally demodulated.Former narrow band signal can be obtained by channel decoding and source decoding in signal after demodulation
Transmission information.
Pseudo-random sequence c (t) is generated by shift register, also referred to as PN code.Such as common M sequence is exactly specific
Existing feedback shift register generate.When the proper polynomial of a linear feedback shift register is primitive polynomial
Become M sequence, a primitive polynomial f*(x)=xnf(x-1).Length is M=2n- 1 M sequence number depends on n times basis
Polynomial number, at the same can to M sequence carry out preferably, select M sequence preferably to as PN code generator.Another
Common PN code generator is Gold sequence, and with better period cross correlation, it is preferred to rely primarily on two M sequences
To the result for carrying out XOR operation.
PN code should follow following principle:
1. there is sharp autocorrelation, it is desirable that Direct-Spread spreading code correlation main peak is as high as possible, and secondary lobe is small as far as possible, with benefit
In low-rate signal is separated in receivers；
2. sequence has balance, carrier wave leakage is prevented；
3. convenient for generation and duplication in engineering.
Present embodiment also discloses the system using the above method, as shown in Figure 1, two ground based terminals of system are logical
It crosses satellite to be attached, satellite is as a Transparent Transponder.The channel of transmission includes signaling channel, Traffic Channel etc..For example,
In ship satellite communication system, ship end and bank end need within a fixed-bandwidth transmission of one line video traffic and a Duan Wenben
The carrier wave of two paths of signals is overlapped transmission by business, the present invention.System includes transmitter and receiver.
As shown in Fig. 2, transmitter include the first source encoder and the second source encoder, the first source encoder it is defeated
Enter the first via signal that end input needs to transmit, the output end of the first source encoder connects the input of the first channel encoder
End, the output end of the first channel encoder connect the input terminal of the first BPSK modulator, and the output end of the first BPSK modulator connects
Connect an input terminal of adder, the second road signal that the input terminal input of the second source encoder needs to transmit, the second information source
The input terminal of the output end connection second channel encoder of encoder, the output end of second channel encoder connect the 2nd BPSK tune
The input terminal of device processed, an input terminal of the output end connection multiplier of the 2nd BPSK modulator, another input of multiplier
End input pseudo-random sequence c (t), another input terminal of the output end connection adder of multiplier, the output end of adder connect
The input terminal of frequency converter is connected, the output end of upconverter connects antenna.
As shown in figure 3, receiver includes low-noise amplifier, antenna received signal is transmitted to by low-noise amplifier
The input terminal of low-converter, the output end of low-converter be separately connected the first bandpass filter input terminal and one of multiplier
Input terminal, the output end of the first bandpass filter connect the input terminal of the first BPSK demodulator, the output of the first BPSK demodulator
The input terminal of the first channel decoder of end connection, the output end of the first channel decoder connect the input of the first source decoder
End, the information of the output end output first via Wideband signal transmission of the first source decoder；Another input terminal of multiplier is defeated
Enter pseudo-random sequence c (t), the output end of multiplier connects the input terminal of the second bandpass filter, the second bandpass filter it is defeated
Outlet connects the input terminal of the 2nd BPSK demodulator, the input of the output end connection second channel decoder of the 2nd BPSK demodulator
End, the output end of second channel decoder connect the input terminal of the second source decoder, and the output end of the second source decoder is defeated
The information of second road Wideband signal transmission out.
Business support flexibility and changeability of the present invention is divided into forward signal and reverse signal in satellite communication system, is proposed
Communication system can be used flexibly, and spread-spectrum signal is superimposed upon within entire authorized spectrum band, as shown in Figure 5, Figure 6.
In addition, present embodiment has also carried out Monte Carlo simulation using Matlab 2018a software to method.Tool
Body simulation process is as follows:
Step 1 intends verifying system due to channel coding, message sink coding and has no and directly affect, and letter is ignored in analogue system
Source code and channel coding.By the randi function in Matlab, the random signal for generating 20000 { -1 ,+1 } is as hair
It penetrates, first 10000 send as broadband signal, start to send again after being sent for 10000, rear 10000 number conduct
Narrow band signal is sent, and the power for setting broadband signal is 10 times of narrow-band power.In satellite communication system, it is equivalent to
EIRP (effective omnidirectional radiation power) broadband signal is 10 times of narrow band signal.Next BPSK tune is carried out to transmitted signal
System, it is on 0 and p that { -1 } and {+1 }, which is respectively mapped to intermediate-freuqncy signal phase,；
Step 2, by second road signal s2(t) be multiplied by locally generated pseudo-random sequence (PN code) c (t), spread spectrum because
Son is set as 1024, PN sequence and is generated using Gold sequence；
Step 3, by two paths of signals s1(t) and s2(t) it is overlapped, and generates random noise using Randn function and be superimposed upon
On signal, then by the signal of transmission by a bandpass filter.
Step 4, the demodulation that the intermediate-freuqncy signal of superposition is directly carried out to bpsk signal, recover the letter of original broadband signal
Breath.By the signal after demodulation and signal contrast is sent, calculates the bit error rate of Monte-Carlo Simulation.
Intermediate-freuqncy signal is carried out auto-correlation (this sequence and transmitter step 2 by PN code sequencer c (t) by step 5
In it is consistent), the signal after being de-spread, and pass through bandpass filter.Then BPSK demodulation will be carried out, narrow band signal biography is recovered
Defeated information.By the signal after demodulation and signal contrast is sent, calculates the bit error rate of Monte-Carlo Simulation.
Equivalent carrier-to-noise ratio C/N after being received by statistics0Range is that the emulation bit error rate between 0dB to 9dB misses ratio
Special rate and theoretical bit error rate, as shown in Fig. 7.The figure effectively shows having for the OCMA method based on Direct Sequence Spread Spectrum
Effect property.
Claims (6)
1. a kind of carrier wave based on Direct Sequence Spread Spectrum is superimposed multiple access method, it is characterised in that: including signal emission process,
Signal emission process the following steps are included:
S11: carrying out message sink coding, channel coding and BPSK to the first via signal that needs transmit and modulate, and obtains first via modulation
Signal s afterwards1(t)；Message sink coding, channel coding and BPSK modulation are carried out to the second road signal that needs transmit, obtain second
The modulated signal s in road2(t)；Wherein, first via signal is broadband signal, and second road signal is narrow band signal；
S12: by s2(t) it is multiplied with pseudo-random sequence c (t), the signal after being spread
S13: by s1(t) andIt is overlapped, after up-conversion, is launched by antenna.
2. the carrier wave according to claim 1 based on Direct Sequence Spread Spectrum is superimposed multiple access method, it is characterised in that: also
Including signal receive process, signal receive process the following steps are included:
S21: electromagnetic wave signal is received by antenna, then obtains intermediate-freuqncy signal through low-noise amplifier and low-converter；
S22: a part of intermediate-freuqncy signal is had a lot of social connections by obtaining first after bandpass filtering, BPSK demodulation, channel decoding and source decoding
The information of band signal transmission；
S23: another part intermediate-freuqncy signal is multiplied with pseudo-random sequence c (t), the signal after being de-spread, then will be after despreading
Signal is by obtaining the information of the second road Wideband signal transmission after bandpass filtering, BPSK demodulation, channel decoding and source decoding.
3. the carrier wave according to claim 1 or described in any one of 2 based on Direct Sequence Spread Spectrum is superimposed multiple access method,
It is characterized by: the pseudo-random sequence c (t) is generated by shift register.
4. the carrier wave according to claim 1 or described in any one of 2 based on Direct Sequence Spread Spectrum is superimposed multiple access method,
It is characterized by: the pseudo-random sequence c (t) is M sequence or Gold sequence.
5. using the system of the carrier wave superposition multiple access method described in claim 1 based on Direct Sequence Spread Spectrum, feature
It is: including transmitter and receiver；Transmitter includes the first source encoder and the second source encoder, the first message sink coding
The first via signal that the input terminal input of device needs to transmit, the output end of the first source encoder connect the first channel encoder
Input terminal, the output end of the first channel encoder connect the input terminal of the first BPSK modulator, the output of the first BPSK modulator
One input terminal of end connection adder, the second road signal that the input terminal input of the second source encoder needs to transmit, second
The input terminal of the output end connection second channel encoder of source encoder, the output end connection second of second channel encoder
The input terminal of BPSK modulator, the 2nd BPSK modulator output end connection multiplier an input terminal, multiplier it is another
A input terminal inputs pseudo-random sequence c (t), another input terminal of the output end connection adder of multiplier, adder it is defeated
Outlet connects the input terminal of upconverter, and the output end of upconverter connects antenna.
6. the system according to claim 5 using the carrier wave superposition multiple access method based on Direct Sequence Spread Spectrum,
Be characterized in that: the receiver includes low-noise amplifier, and antenna received signal is transmitted to lower change by low-noise amplifier
The input terminal of frequency device, the output end of low-converter are separately connected an input of the input terminal and multiplier of the first bandpass filter
End, the output end of the first bandpass filter connect the input terminal of the first BPSK demodulator, and the output end of the first BPSK demodulator connects
The input terminal of the first channel decoder is connect, the output end of the first channel decoder connects the input terminal of the first source decoder, the
The information of the output end output first via Wideband signal transmission of one source decoder；Another input terminal input of multiplier it is pseudo- with
Machine sequence c (t), the output end of multiplier connect the input terminal of the second bandpass filter, and the output end of the second bandpass filter connects
The input terminal of the 2nd BPSK demodulator is connect, the output end of the 2nd BPSK demodulator connects the input terminal of second channel decoder, the
The output end of two channel decoders connects the input terminal of the second source decoder, the output end output second of the second source decoder
The information of road Wideband signal transmission.
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| CN110049427A (en) * | 2019-05-16 | 2019-07-23 | 上海纽菲斯信息科技有限公司 | A kind of sonic data communication system and method for realizing plurality of earphone while detection |
| CN110213009A (en) * | 2019-07-23 | 2019-09-06 | 电子科技大学 | A kind of safety communicating method based on power mixing |
| CN111211807A (en) * | 2020-03-17 | 2020-05-29 | 南京凯瑞得信息科技有限公司 | Multi-channel carrier superposition multi-address access method and system |
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